principal value
is chosen to be 3, the principal value.
Similarly sin30°=sin150°=sin(−210°) = 0.5, but sin−1 0.5 = 30°. Sine is not an invertible function, but by choosing principal values a function sin–1: [–1,1]→[–90°,90°] can be defined such that sin(sin–1x) = x for –1 ≤ x ≤ 1.
See also argument, multifunction.
- parabola
- parabolic coordinates
- parabolic cylinder
- parabolic partial differential equation
- parabolic spiral
- paraboloid
- paradox
- parallel
- parallel axis theorem
- parallel computation
- parallelepiped
- parallelogram
- parallelogram law
- parallel postulate
- parallel transport
- parameter
- parameter
- parameterization
- parameterized surface
- parametric equations
- parametric equations
- parametric statistics
- parentheses
- Pareto chart
- parity